柽柳灌丛关键物候参数多种植被指数遥感提取的适用性——基于CO2通量观测和Sentinel-2数据

doi:10.13287/j.1001-9332.202112.007

应用生态学报 ›› 2021, Vol. 32 ›› Issue (12): 4315-4326.doi: 10.13287/j.1001-9332.202112.007

柽柳灌丛关键物候参数多种植被指数遥感提取的适用性——基于CO₂通量观测和Sentinel-2数据

周昊强^1,2, 包刚^1,2*, 金胡格吉乐吐^1,2,3, 杜灵通^4,5, 张斯莲⁶, 徐自为⁷, 包玉海^1,2

¹内蒙古师范大学地理科学学院, 呼和浩特 010022;
²内蒙古师范大学内蒙古自治区遥感与地理信息系统重点实验室, 呼和浩特 010022;
³内蒙古师范大学旅游学院, 呼和浩特 010022;
⁴宁夏大学西北土地退化与生态恢复省部共建国家重点实验室培育基地, 银川 750021;
⁵宁夏大学西北退化生态系统恢复与重建教育部重点实验室, 银川 750021;
⁶内蒙古阿拉善盟气象局, 内蒙古阿拉善盟 750306;
⁷北京师范大学地表过程与资源生态国家重点实验室, 地理科学学部, 北京 100875

收稿日期:2021-05-03 修回日期:2021-08-06 出版日期:2021-12-15 发布日期:2022-06-15
通讯作者: *E-mail: baogang@imnu.edu.cn
作者简介:周昊强, 男, 1997年生, 硕士研究生。主要从事资源环境遥感应用研究。E-mail: 1664937221@qq.com
基金资助:
国家自然科学基金项目(41861021)、内蒙古自治区自然科学基金项目(2021MS04014)和内蒙古高校科技英才项目(NJYT-18-A11)资助

Applicability of multiple remotely sensed vegetation indices for extracting key phenological metrics of Tamarix chinensis shrubs based on CO₂ flux observation and Sentinel-2 data

ZHOU Hao-qiang^1,2, BAO Gang^1,2*, JIN Hugejiletu^1,2,3, DU Ling-tong^4,5, ZHANG Si-lian⁶, XU Zi-wei⁷, BAO Yu-hai^1,2

¹College of Geographical Science, Inner Mongolia Normal University, Hohhot 010022, China;
²Inner Mongolia Key Laboratory of Remote Sensing & Geography Information System, Inner Mongolia Normal University, Hohhot 010022, China;
³College of Tourism, Inner Mongolia Normal University, Hohhot 010022, China;
⁴Breeding Base for State Key Laboratory of land Degradation and Ecological Restoration in Northwest China, Ningxia University, Yinchuan 750021, China;
⁵Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwest China of Ministry of Education, Ningxia University, Yinchuan 750021, China;
⁶Alxa League Meteorological Bureau of Inner Mongolia, Alxa League 750306, Inner Mongolia, China;
⁷State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China

Received:2021-05-03 Revised:2021-08-06 Online:2021-12-15 Published:2022-06-15
Contact: *E-mail: baogang@imnu.edu.cn
Supported by:
National Natural Science Foundation of China (41861021), the Natural Science Foundation of Inner Mongolia Autonomous Region (2021MS04014), and the Talent Project of Science and Technology in Inner Mongolia (NJYT-18-A11)

摘要/Abstract

摘要： 本研究以额济纳绿洲四道桥超级站为研究区,结合2018—2019年涡度通量、气象数据和2017—2020年Sentinel-2遥感影像,分析通量塔总初级生产力(GPP)与环境因子的关系,评估12种遥感植被指数对柽柳灌丛长势模拟和关键物候参数提取的适用性。采用7参数双逻辑斯蒂函数(DL-7)+全局模型函数(GMF)拟合GPP和各植被指数生长曲线,并逐年提取生长季始期(SOS)、生长季峰期(POS)和生长季末期(EOS)3种关键物候参数。结果表明: 有效积温(GDD)和土壤含水量是影响柽柳灌丛物候动态的主要环境因子。与2018年相比,2019年由于气温较低,SOS前的积温累积速率较慢,柽柳灌丛需要更长时间的热量积累来进入生长季,从而导致2019年SOS比2018年晚。在SOS与POS之间,2018和2019年水热条件相似,但2019年POS比2018年晚8 d,可能是2019年SOS较晚所致。POS以后,2019年较高的GDD和较低的土壤含水量使柽柳灌丛遭受水分胁迫,导致其生长季后期时间缩短。标准化的Sentinel-2植被指数与10:00—14:00 GPP均值的线性回归结果表明,宽波段植被指数中的增强型植被指数和窄波段植被指数中的叶绿素红边指数、倒红边叶绿素指数、红边归一化植被指数(NDVI705)能够较好地反映与柽柳灌丛GPP具有较高的一致性。柽柳灌丛SOS和EOS的遥感提取结果表明,Sentinel-2窄波段植被指数比宽波段植被指数的准确性更高,尤其是修正叶绿素吸收反射率指数提取SOS最准确,MERIS陆地叶绿素指数提取EOS最准确;Sentinel-2宽波段植被指数提取POS的准确性更高,尤其是两波段增强型植被指数和植被近红外反射率指数最准确。综合所有物候参数来看,NDVI705综合表现最佳。

关键词: 柽柳, 涡度协方差, Sentinel-2, 生长曲线拟合, 关键物候参数

Abstract: We analyzed the relationship between gross primary productivity (GPP) and environmental factors at Sidaoqiao Superstation of the Ejina Oasis in China’s Gobi Desert, by combining eddy flux and meteorological data from 2018 to 2019 and Sentinel-2 remote sensing images from 2017 to 2020. We evaluated the applicability of 12 remote sensing vegetation indices to simulate the growth of Tamarix chinensis and extract key phenological metrics. A seven-parameter double-logistic function (DL-7) + global model function (GMF) was used to fit the growth curves of GPP and vegetation indices. Three key phenological metrics, i.e., the start of the growing season (SOS), the peak of the growing season (POS), and the end of the growing season (EOS), were extracted for each year. Growing season degree days (GDD) and soil water content were the main environmental factors affecting the phenological dynamics of T. chinensis. Compared with 2018, the lower temperatures in 2019 resulted in slower accumulation rate of accumulated temperature before the SOS. T. chinensis required longer heat accumulation to enter growing season, which might cause later SOS in 2019. The hydrothermal conditions between SOS and POS were similar for 2018 and 2019. Howe-ver, the POS in 2019 was 8 days later than that in 2018, because of the late SOS in 2019. Following the POS in 2019, high GDD and low soil water content caused the T. chinensis to suffer from water stress, resulting in a shortened late growing season. The linear regression between the standardized Sentinel-2 vegetation index and the average value of GPP between 10:00 and 14:00 indicated that the enhanced vegetation index of the broadband vegetation index and the chlorophyll red edge index, inverted red edge chlorophyll index, and red-edge normalized difference vegetation index (NDVI705) of the narrowband vegetation index were highly consistent with the GPP of T. chinensis. Remote sensing extraction of SOS and POS of T. chinensis suggested that the Sentinel-2 narrowband vegetation index was more accurate than the broadband vegetation index. The modified chlorophyll absorption in reflectance index provided the most accurate extraction of SOS, while the MERIS terrestrial chlorophyll index provided the most accurate extraction of EOS. Conversely, the Sentinel-2 broadband vegetation index was the most accurate for extracting POS, especially the 2-band enhanced vegetation index and the near-infrared reflectance of vegetation. Overall, NDVI705 was the best index to estimate phenological metrics.

Key words: Tamarix chinensis, eddy covariance, Sentinel-2, growth curve fitting, key phenological metrics

周昊强, 包刚, 金胡格吉乐吐, 杜灵通, 张斯莲, 徐自为, 包玉海. 柽柳灌丛关键物候参数多种植被指数遥感提取的适用性——基于CO₂通量观测和Sentinel-2数据[J]. 应用生态学报, 2021, 32(12): 4315-4326.

ZHOU Hao-qiang, BAO Gang, JIN Hugejiletu, DU Ling-tong, ZHANG Si-lian, XU Zi-wei, BAO Yu-hai. Applicability of multiple remotely sensed vegetation indices for extracting key phenological metrics of Tamarix chinensis shrubs based on CO₂ flux observation and Sentinel-2 data[J]. Chinese Journal of Applied Ecology, 2021, 32(12): 4315-4326.

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柽柳灌丛关键物候参数多种植被指数遥感提取的适用性——基于CO₂通量观测和Sentinel-2数据

Applicability of multiple remotely sensed vegetation indices for extracting key phenological metrics of Tamarix chinensis shrubs based on CO₂ flux observation and Sentinel-2 data

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